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An MD80 captain reports wrong circuit breaker tripped for deferred item. Caused by MEL not giving specific circuit breaker locations to pull and collar.
| Attributes | |
| ACN | 661586 |
| Time | |
| Date | 200506 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : parked |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 661586 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : non compliance with mel non adherence : far non adherence : published procedure |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : manuals performance deficiency : non compliance with legal requirements performance deficiency : logbook entry |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Flight Crew Human Performance Chart Or Publication Aircraft |
| Primary Problem | Chart Or Publication |
| Situations | |
| Publication | MEL |
Narrative:
This is not a cya report; but to point out that when the MEL does not give specific circuit breaker locations to trip and collar; that there is an opportunity to easily trip and collar the wrong circuit breaker! I was on aircraft XXX this morning; flight YYY; and after doing the logbook review and reading the MEL (we had MEL 21-2A) I found the wrong (M-22) circuit breaker tripped and collared. I called maintenance control and asked what circuit breaker was supposed to be tripped and collared. They said U-26. Had I not noticed that M-22 is on the ice protection left dc buss; I would have never questioned the circuit breaker being the wrong one tripped. Why you ask? M-22 is 'left supply air temperature and pressure high caution.' U-26 is 'left supply air temperature high caution.' see where an error can be easily made by looking at the 'circuit breaker name'? I made an entry in the logbook saying that the wrong circuit breaker was tripped per pilot report and contract maintenance tripped and collared the correct circuit breaker after consulting with maintenance control and reset M-22 and signed off the logbook. We then departed 23 mins late. I know that the various circuit breaker panels vary from aircraft confign to aircraft confign; and the different panels prevent from listing the specific circuit breaker locations in the MEL; but this is definitely one of those gotcha's.
Original NASA ASRS Text
Title: AN MD80 CAPT RPTS WRONG CIRCUIT BREAKER TRIPPED FOR DEFERRED ITEM. CAUSED BY MEL NOT GIVING SPECIFIC CIRCUIT BREAKER LOCATIONS TO PULL AND COLLAR.
Narrative: THIS IS NOT A CYA RPT; BUT TO POINT OUT THAT WHEN THE MEL DOES NOT GIVE SPECIFIC CIRCUIT BREAKER LOCATIONS TO TRIP AND COLLAR; THAT THERE IS AN OPPORTUNITY TO EASILY TRIP AND COLLAR THE WRONG CIRCUIT BREAKER! I WAS ON ACFT XXX THIS MORNING; FLT YYY; AND AFTER DOING THE LOGBOOK REVIEW AND READING THE MEL (WE HAD MEL 21-2A) I FOUND THE WRONG (M-22) CIRCUIT BREAKER TRIPPED AND COLLARED. I CALLED MAINT CTL AND ASKED WHAT CIRCUIT BREAKER WAS SUPPOSED TO BE TRIPPED AND COLLARED. THEY SAID U-26. HAD I NOT NOTICED THAT M-22 IS ON THE ICE PROTECTION L DC BUSS; I WOULD HAVE NEVER QUESTIONED THE CIRCUIT BREAKER BEING THE WRONG ONE TRIPPED. WHY YOU ASK? M-22 IS 'L SUPPLY AIR TEMP AND PRESSURE HIGH CAUTION.' U-26 IS 'L SUPPLY AIR TEMP HIGH CAUTION.' SEE WHERE AN ERROR CAN BE EASILY MADE BY LOOKING AT THE 'CIRCUIT BREAKER NAME'? I MADE AN ENTRY IN THE LOGBOOK SAYING THAT THE WRONG CIRCUIT BREAKER WAS TRIPPED PER PLT RPT AND CONTRACT MAINT TRIPPED AND COLLARED THE CORRECT CIRCUIT BREAKER AFTER CONSULTING WITH MAINT CTL AND RESET M-22 AND SIGNED OFF THE LOGBOOK. WE THEN DEPARTED 23 MINS LATE. I KNOW THAT THE VARIOUS CIRCUIT BREAKER PANELS VARY FROM ACFT CONFIGN TO ACFT CONFIGN; AND THE DIFFERENT PANELS PREVENT FROM LISTING THE SPECIFIC CIRCUIT BREAKER LOCATIONS IN THE MEL; BUT THIS IS DEFINITELY ONE OF THOSE GOTCHA'S.
Data retrieved from NASA's ASRS site as of January 2009 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.